.comment-tree {
  padding: 20rpx;
  background-color: #f4f4f4;
}

.problem {
  background-color: #fff;
  padding: 20rpx;
  margin-bottom: 20rpx;
  border-radius: 8rpx;
}

.problem-title {
  font-size: 36rpx;
  font-weight: bold;
  display: block;
  margin-bottom: 10rpx;
}

.problem-text {
  font-size: 28rpx;
  display: block;
  margin-bottom: 10rpx;
}

.problem-meta {
  font-size: 24rpx;
  color: #6c757d;
  display: block;
}

.comment {
  background-color: #fff;
  padding: 20rpx;
  margin-bottom: 20rpx;
  border-left: 4rpx solid #007bff;
  border-radius: 8rpx;
}

.reply {
  background-color: #e9ecef;
  padding: 20rpx;
  margin-top: 20rpx;
  margin-left: 40rpx;
  border-left: 4rpx solid #28a745;
  border-radius: 8rpx;
}

.comment-content {
  font-size: 28rpx;
  display: block;
  margin-bottom: 10rpx;
}

.comment-meta {
  font-size: 24rpx;
  color: #6c757d;
  display: block;
}

.reply-chain {
  font-size: 22rpx;
  color: #495057;
  display: block;
  margin-top: 10rpx;
}